Author: mav
Date: Fri Nov 20 05:46:27 2020
New Revision: 367862
URL: https://svnweb.freebsd.org/changeset/base/367862
Log:
Microoptimize cam_num_doneqs math in xpt_done().
MFC after: 1 week
Modified:
head/sys/cam/cam_xpt.c
Modified: head/sys/cam/cam_xpt.c
==============================================================================
--- head/sys/cam/cam_xpt.c Fri Nov 20 03:54:46 2020 (r367861)
+++ head/sys/cam/cam_xpt.c Fri Nov 20 05:46:27 2020 (r367862)
@@ -178,7 +178,7 @@ struct cam_doneq {
};
static struct cam_doneq cam_doneqs[MAXCPU];
-static int cam_num_doneqs;
+static u_int __read_mostly cam_num_doneqs;
static struct proc *cam_proc;
SYSCTL_INT(_kern_cam, OID_AUTO, num_doneqs, CTLFLAG_RDTUN,
@@ -4620,7 +4620,7 @@ xpt_done(union ccb *done_ccb)
/* Store the time the ccb was in the sim */
done_ccb->ccb_h.qos.periph_data =
cam_iosched_delta_t(done_ccb->ccb_h.qos.periph_data);
- hash = (done_ccb->ccb_h.path_id + done_ccb->ccb_h.target_id +
+ hash = (u_int)(done_ccb->ccb_h.path_id + done_ccb->ccb_h.target_id +
done_ccb->ccb_h.target_lun) % cam_num_doneqs;
queue = &cam_doneqs[hash];
mtx_lock(&queue->cam_doneq_mtx);
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